I need some advice.

My husband, daughter and I have a Disney trip planned in mid January and made ADR's for every evening there. Here's the problem - my husband isn't sure if he will be able to make this trip with us and it may end up just my DD and me. Will I need to cancel my current ADRs and reschedule or just show up with 2 instead of a party of 3? If we show up without him, will we owe a $10 fee for my DH not showing up? He won't know until the beginning of the year if he'll be able to come or not and by then if we try to cancel and to reschedule I doubt I'll be able to get the ADRs that I want. A party of 4 going down to a party of 3 is no problem - same size table, but a party of 3 to a party of 2 would be a different table seating.

Need a little help from my Disney friends. What do I do?