Originally Posted by Blackcat31:
So they want you to lose income every other week so they can save money?
Do you have other families interested in the opposite weeks this family doesn't need? If not, it seems to me needing care only on alternating weeks is the FAMILY'S situation to figure out, not yours.
~Unless you WANT to lose income saving space not used so someone else can save money. 
This.
If they want to reserve a full week for their use they need to pay for it, unless you can fill in with another family. In which case you charge 75% the regular amount to each family so you end up being paid 150% your regular amount for the PT weeks.
If you allow them to pay actual use you're subsidizing their care. I don't know about you, but all of my families are better off than I am financially so I don't feel bad about refusing to subsidize their care.