I'd leave it at the first sentence. Maybe, "I'll stay at Mom's Sat night to you can stay with S at the house. TM me (or call, whatever you prefer) coordinate on what time you will arrive and leave."

Me 57/H 58
M36 S 2.5yrs R 12/13

Let me give up the need to know why things happen as they do.
I will never know and constant wondering is constant suffering.
Caroline Myss