Squeeky congratulations on 3 boys 
I'm close to my sons in different ways, I would say that my experience is that female partners' families can take precedence and have done for us in a lot of situations. However, we've always tried not to get too hung up on that or let it drive a wedge otherwise sons can be piggy in the middle and no one likes a moaner, so as long as you see them and we do, it's best not to roll out the whole "but you were at theirs for Christmas last year" sort of prattle We've always seen quite a lot of our grandchildren and since our son's relationship with their mother finished we have him and the children here alternate weekends.
As far as the growing up years are concerned it seems that here in the west, girls are the favoured child and yeah I got the "I expect you're hoping for a girl" a lot. Boys were and possibly still are regarded as a consolation prize
regretfully, but be thankful for your boys, they're much kinder and less critical of their mothers in many respects, in spite of one of mine being the teenager from hell, even at the height of that he'd still manage to tell me "oh you're looking nice mum" maybe disingenuous to get himself of the hook
but I can never remember being criticised appearance wise, whereas friends who had daughters told me their girls could be hyper critical.
The lack of male teachers is a disadvantage for boys, particularly adolescence and teen years, the curriculum, when my kids were going through was pretty feminised, that was the consensus of them, their male peer group and the other parents I spoke to. A minority of female teachers made it clear they preferred teaching girls to boys, possibly because boys are more challenging. One of my sons appreciated the fact after all the female teachers in junior and senior school, for A levels and University, lecturers were often male, that's not to say he doesn't appreciate women in the workplace, he tells me the best boss he ever had was female, in fact he positively prefers female colleagues, maybe because he and his partner were former colleagues 
When they are young some boys, mine included make a lot of noise and seem to spend their days "exploding" maybe it was my imagination, or a reaction to having the subliminal message that boys are a noisy nuisance, but it seemed to me that prepubescent girls flounced about, giving orders whilst simultaneously pointing their toes, and whilst boys got on the nerves of mothers of daughters because of their general rowdiness, similarly the "toe pointers" got on my wick. That stayed with me until I had a granddaughter and that feeling evaporated with her arrival
Anyway treasure your boys OP, all relationships are different, I know women who don't get on with their mothers at all and don't want to spend any time with them it's not a foregone conclusion that somehow your role in your sons' lives when they are adults, will not be a close one.