DrTomorrow is right on the mark.
When we (myself and DW) decided to invite my in-laws (her parents), it was because we wanted to spend the time together with them. As such, there is no way we would consider asking them to pay and have refused their offers to pay towards the room.
If it was someone elses idea, for whatever reason, to use our DVC points for some group vacation, then there would be some discussion of the group members contributing to the cost of the points, especially if it envolved boworring future points.
In the OPs case, it seems undecided who's idea is was, who invited who etc. Now I think the OPs only option, short of causing a family rift, is to hope for the best. Maybe they will cover that meal out (or two).
When we (myself and DW) decided to invite my in-laws (her parents), it was because we wanted to spend the time together with them. As such, there is no way we would consider asking them to pay and have refused their offers to pay towards the room.
If it was someone elses idea, for whatever reason, to use our DVC points for some group vacation, then there would be some discussion of the group members contributing to the cost of the points, especially if it envolved boworring future points.
In the OPs case, it seems undecided who's idea is was, who invited who etc. Now I think the OPs only option, short of causing a family rift, is to hope for the best. Maybe they will cover that meal out (or two).