Well I wanted 3 girls. Or failing that, 2 girls and then a boy. I didn't want a girl then a boy, because that was the family I grew up in, and the boy was very much doted on to the exclusion of all else. My mother also grew up in that family dynamic and had a precious little golden brother too
So we had girl, then boy. We knew DC2 was a boy from the 32 week scan so had already planned DC3 before I'd given birth. Everyone told us we didn't need any more children because we had the Perfect Family. I disagreed.
DC3 was a boy. We thought we'd have one last try for DD2 and ended up instead with DS3. Many many years later we had DC5 and by this time we were so used to being a family of boys we expected - and wanted - another boy. So we got DD2.
DD1 was a nightmare until she was 11, then left home at 17 :( The so-called mother-daughter bond does not exist. Neither does the father-daughter bond :( She keeps in touch rarely and isn't that bothered whether she sees us or not. I see my mum far more often than I see my DD. (Mum lives about 20 miles away, DD about 2 miles).
DS2 has a very strong family bond
If any of them provide GC it will be him.
I think the moral of this very long tale is have a 3rd if you want a 3rd child. Do not try for a girl if you would not entertain the thought of having a boy, or if you think it will upset the family dynamics. Do not expect a girl to provide some mythical bond. She may well do so, but equally well she may not. BTW 3 boys is ace 