Make sure you document your coming home early on W's request. All documentation should be devoid of feeling or opinions, just facts - handwritten and dated notes in a notebook works just fine.
"4/29/16 - left work x hours early on W's request to take care of children. W stated she was going to (city) to take her father for an MRI. I arrived home at 2:30pm. W left at X:XXpm. She did not wait for Child 4 and 5 who were to arrive home at X:XXpm."
M 16 yrs, WH62, P54 3 adult blended kids EA 11/13, BD1 6/14 PA fall 14, BD2 2/15 Piecing 2015, BD3 12/15 Separated 4/16 WH moved OW in 5/16 Divorced 6/15/17