I have ds23, ds21, dd20 and ss19, ss22, ssil24, sd25.

They mostly ignore each other. skids don't speak, even to each other much. My three are pretty animated and chatty. THey all have dif personalities.

The two girls have had a big spat because dd20 borrowed some of sd25 things without asking and sd went apeshit. dd said she was sorry, sd ranted for 3 hours about how disrespectful it was. dd finally told sd that's why she didn't live with her parents and leave her stuff out where her siblings could borrow things. sd went even more apeshit. dd left the room.

All the boys get along fine. dd gets along well with all the others. sd gets along well with all the others too. they all have gfs/bfs now and we had all 12 home for the holidays. it was fine.

I'll be really interested to see how this plays out for us when our bios grow up. SS is 22 and DS is 3 & DD is 7 months. So there is quite an age gap. DS adores SS but we rarely see him.

I know DH is 20 years older than his half sisters from his dad's 2nd marriage and they are not close at all. I probably talk to them more than he does and that's maybe twice a year.

I have adult skids and joint minor bios with DH. Like SA, big age difference and geography keeps them apart. Also not relationships I will encourage. Unhealthly attitude towards me = stay away from my kids!