@blahblahusername124,
If you are asking for my support as a father, you have my support.
A father should have the same rights as a mother has when it comes to custody (it doesn't always happen this way). When the mother is unable to take care of the kids, it is only logical for you to take custody.
That being said, the best thing possible is for the father and mother to agree on what is best for the children. If you can cooperate with the mother, do that. Of course the needs of the children come first.
When I divorced, my ex-wife got a nasty lawyer and was preparing a slash and burn strategy. I got a great lawyer who told me my rights and told me rather than to fight back, to try to work out a great deal. Thanks to my lawyer I knew where the limits were. I ended up with 50 percent legal custody and 49% physical custody (only to establish which school district my daughter would be in).
My ex-wife saw the 51% as a great victory. I chuckled with my lawyer (since it was legally meaningless), and we worked out a fairly civil co-parenting arrangement (no thanks to her nasty lawyer who slunk back into whatever swamp she came from).
In short.
1) Get a lawyer.
2) Put the needs of the children first
3) If you can be civil and work out something without fighting, do that.
4) Get a lawyer.
5. Get a lawyer (the point here is that you can't make any good decisions without a good lawyer).