can you list some of the research you found

I can surely see it. The divorce rate being way higher. I baby my own child like no other, and hardly interact with the stepchild living in the same home. Not out of resentment or distaste, but just because I love my own child more than I've loved anyone. There will almost certainly be two standards by which children are raised.

I can see a million wives being resentful that their new hubby doesn't baby their previous child. In a way, it seems messed up that a male is expected to treat non-biological children as biological children, especially if he and his wife had that conversation before the "I-do's".

I read a lot on these forums, and just the "disengagement" stories I read, I ask myself "how did this not end in divorce?" I think there may be a difference in the dynamic of a male rejecting a woman's child vs a woman rejecting a man's child. You said you did research, is there any data pertaining to that?

Do you want to be a parent? If you do, just know that someone else's kids will always be someone else's kids, and stepkids are no substitute for real kids.  My kids are my pride and joy. Stepkids never, ever could be anything other than DH's kids at best and in the case of my stepson, a feral animal I wish did not exist.

There are countless examples of parents who have REAL children that they have no biological relationship with.

So I call bullshit on the premise that parental feelings have to be stronger toward bio spawn than non biospawn.  

While I have no known BK's and can personally neither confirm nor deny stronger feelings for a BK verses a non BK, logic and countless examples provide ample evidence to indicate that parental feelings do not require biological relationship.

Sure, subsequent marriages have a higher rate of failure than initial marriages.  However, those in subsequent marriages are proven failures at marriage at the very beginning of a subsequent marriage.  The addition of a joint biochild to a blended family marriage that ultimately fails does little more than highlight the character flaws of one or both of the blended family spouses that were inherrently there to begin with.

Some kids lose the parent lottery.  Kids born into blended family marriages lose the parent lottery far more frequently than those born to initial marriages because... the parent pool they are stuck with is far more likely to be tragically flawed to begin with.

Fortunately even kids born into blended marriages do not have to lose the parent lottery.  Some are the product of subsequent marriages that are far better matches than their parents may have had in prior marriages. So, children of subsequent relationships might be better off than their elder half sibs by prior parental pairings.

If partners in a marriage make their marriage and each other the uncontested priority, establish boundaries, behavioral and performance standards and parent all children within those boundaries and standards  blended families, including those with  joint BKs, can be successful.  Sadly... far too many adults are too stupid to recognize this simple truth and repeat the same crap that caused their initial marriage(s) to fail.  

The excuse of additional children causings subsequenct marriage failure is just that, a bullshit excuse IMHO.

Just my  thoughts and opinion of course.

I am in a similar boat. I plan on having a child with my soon to be fiance who already has a 5yr old daughter. We go back and forth with her worrying if I love her daughter like she's my own once we have a child. And I worry about her favoring her previous daughter because of her less perfect family circumstances and the daughter being jealous of the new baby. The hard truth is I already know that I will not love any child the way I would the one that comes from my own body which I'm pretty sure is a totally normal feeling. It's also going to be hard to truly form a bond with her daughter when her deadbeat bio-dad constantly feeds her lies and nonsense when he's with her, putting a wedge between us and making a difficult situation even harder. 

Let's keep in touch on our journeys and be each other's sponser haha!

Just early on, I didn't know if I really wanted a relationship with a man who already had kids and I put off meeting my now husbands son because of it.  That was hurtful to him, but I was being honest.  It led to discussions as to how we would handle things when we did decide to get married. Ironically though, my daugther is engaged to a man with kids and our approach couldn't be more different.  But I digress..lol

My stepson was NEVER told he has 2 homes.  He is a member of the family but not a member of the household and a visiting guest in our home.  His home was with his mother.  The reason I did this is his mother WAS NOT vicariously in charge of NOTHING at my home, and oh she tried.  No outside source was making a decision in OUR HOME regardless of the situation.  No kid was going to cause friction or dictate the goings on. I know that a lot of people don't agree with my approach and that is okay.  But that approach alileviated a lot of BS and again, SS's mother tried and finally gave up.I am THANKFUL, my husband stuck to our household.  

My stepson, was happy he was getting siblings.  Of course his mother wasn't, but what could she do?  He once told his dad that he felt WE wouldn't spend time with him anymore.  We asked why he felt that way and of course his mother told him this.  WE told him that of course he has to SHARE but if he ever felt he was being ignored speak up.  We never got that call.FF 30 yrs later, we are all very close, including his mother and her hussband.