I don't know much about my ex's rights, though assume that his DW will get permission to take the baby if she wants - she's not worked since having him, whilst my ex has worked. She'd have family to support her there, and not much here.
Not sure about skyping, etc - my kids use skype, but their brother's only a year old, so too young really. He'll soon forget who they are :(
Not sure how amicalbe things will be between them - my ex is generally reasonable with me, but then I've never really given him reason not to be. But even if things are amicable, I don't see any way that the kids will see their brother unless his mum brings him over here to visit - and I don't think a court could force her to do that, could it?
My ex might manage to afford to get out there, say once a year, but he's not likely to be able to afford to take the kids with him. He's never taken them there yet. His DW's family have never wanted much to do with my kids, or really acknowledged their existance, so don't see them putting them up for a visit.
Might try and talk to my ex about it - though imagine he must be pretty cut up about it and I'm struggling not to feel emotional myself about it right now, and what affect it's going to have on my DCs :(