I think the siblings would be lucky to get parents and be in the same home-
I would however make sure DH is ready for this and IS on board because I could imagine 3 WILL be a handful-
I do think though that with you all already watching kids, ect. that at least you have an insight somewhat of what to expect-
NOW just multiply it times 3
lol
Good Luck- I hope all goes well for you both- keep us informed