I guess the bottom line is that he does have two kids.. not just your one.  Is it kind of mean to expect his older child to sit there at christmas and watch him open daddy gifts that only recognize he has one child? not two? 

Honestly, I think it would be a kindness to provide him both.  A gift is supposed to be something you think the recipient would like... he would likely be thrilled to get a pair with both children on it. or one of each.  He has already hinted that to you.

But, you obviously are not obligated to do anything.. but you know it would be something he would like.

I would get something with his daughters image name whatever on it. TO MAKE HIM HAPPY. Not becuase you are doing it for his daughter. I have had to do a lot to make DH happy over the years and some of them are just plain stupid! For example I have hung our stockings on the fireplace for the past 4 years. I always goes in the same order - DH, then mine, then SD's then the dogs. Well this year I decided to hang them from the 3 pane window near the tree (and not hang the dogs). So I did it DH, then me, then SD. The first thing he noticed was that from one angle in the livingroom her stocking was partially blocked by the tree (everywhere else you could see it just fine). He got butt hurt and bothered so bad by it that I had to rearrange the order. 

 I think getting another pair of socks with the daughter's  picture too would show how thoughtful you are. 

I agree with the sentiment that the gift is for him, so it should be something he would enjoy. He would probably enjoy two pairs of socks with both kids' faces on them.

I think this is a situation where, since the gift is a thing, it should include both kids. If the gift were part of an experience, that would be different. I'm assuming the socks are something where you submit a picture and they print the socks with the face, yes? That's a thing. Aside from purchasing the item and sending the picture, you're not involved in the process of making it. It is easy enough to send another photo and $20 for a second pair.

Now, that changes when it's something that you're helping create and the experience of making the thing is just as important as the thing itself. If you want to take baby to get their footprints painted onto a decorative plate that you get to design and paint, too, I don't think your SK needs to be involved. In fact, if your SK wanted to paint some pottery for their dad, that sounds like an EXCELLENT father-child outing because making the thing - putting in the effort, making it personalized, spending time to do it - is what matters.

I'll just be the salty one on this thread and say I feel like it is the other parents job to provide gifts from that kid. I provide a gift for my ex as the gift from the child that we share. I feel like it is my partner's ex who should provide gifts from his kids to him. I don't personally take that on and feel no guilt about it. It is not my responsibility.

I don't do personalized gifts like this because of this very reason. The only personalized gifts DH gets are drawings or cute little crafts things with the kid's foot/hand prints. 

I almost ordered the socks you're talking about but I was planning on just doing a picture of the dog!

I personally would do it for both kids - depending on circumstances of your situation.  

I looked back at your earlier post in 2019.. the girl was 6 then.. so she is 8.  your child is under 2 I think?  

I think I would ask SD if she wants to give her daddy socks with her face on them?  I think it's fine to help a skid get a present for their parent/your partner.

If money is so tight that you cannot swing that.. that is an entirely other situation.

I think it depends on the age of his other child, your relationship with the other child, whether the BM typically gets him a gift from the other child, your resources and any number of things.  It's not the same for every step family. 

If I'm getting personalized gifts, I generally include all of DH's kids.  It may be one item with all three kids, or it might be one with my DD and one or two with the SDs.  I also make sure each child has a gift for DH.  BUT . . . we have the SDs half the time,  they are young and I have a relatively good relationship with them, and they are very good sisters to my DD (their half sister).  If they were disrespectful teens whose mother made my life a living hell, or who weren't kind to my DD, there's no way I'd buy a gift for them to give, even if I'd be doing it mostly for DH.

I would order 2 pairs of sock's. One pair  with EACH kids face on them., THEN package them as a pair. Left foot kid number 1, right foot kid number 2. BING BAM done. That would be cute.

Order 2 air fresheners, 1 with each kiddo pic? Package them together as 1 gift?

Is that possible...?

I had previously gotten him a car freshener with his son's face on it and he had been saying he wanted one of his daughter too

So, you have your answer.

The reality is, the gifts are from you and like LD stated, they should be something that he would enjoy and you know that he would love to have socks with BOTH of his kids' faces on them (there's a sentence I never thought I would say!).

He will love his gifts, you will feel good that he loves his gifts, SD will feel good. Win-win all around for very little effort.