I am having an almost impossible time calculating child support when there is divided residency. I have two children with the ex, 13 and 17.  The 17 year old just moved in with me.  I also have a 3 year old daughter with my current wife.  Last time child support was calculated, a multiple family application was used.  The things I have read state that for divided residency, each parent completes a worksheet for one child.  The scenario in child support guidelines looks like child support would equal 0 because both are in the same age category. The combined income for both of us is 6339 and the percentages are 48% (me) and 52%.

1.  When preparing worksheets, does each parent calculate their percentage for each child or just the total obligation for each child?  Should the worksheet we prepare say that the obligation for the 17 year old is 1036, or should it state that she is responsible for $542 and I am responsible for $495 and use a 2-child worksheet when calculating for other child that lives with her (since I am responsible for an additional child)

2.  How do I calculate the other child (3 year old)?

Hope this makes sense!