Yes
No. In general, child support is a percentage of net income.
In general, the law does not modify child support based on other children living with the obligor.
NO!
yes
no
no
Each case is treated separately so the first child will no longer receive child support when he/she turns 18 as with the younger child.
Maryland does not have that specific provision, but all child support is rebuttable.
no
Yes
no
Yes, it can. Moving in with the other parent is grounds for "flipping" child support payments. However, this must be done by court order.