I would say at least half. Half is obviously the easy just split it kind of way to go. She has the kids most of the time, so maybe she could use a little more of it, but then you are giving her plenty of financial help, so...
Could the money be used to pay off/fix the car instead? It might be worth asking W what her financial priorities are.
Of course, if she wants cash in hand, giving her half is totally reasonable. Anything the kids need can always be figured out separately from the taxes.
Michelle - Proud DR Rockette S: 28JUL07, D'd: 29OCT09 http://tinyurl.com/27j9qo2
