I have not heard of one offer of help to spend time with mom or take her to any of her medical appointments whilst dad puts in the hours, but then I really beleive that it has been a set up as quite a few noses were put out of joint when dad insisted on making public the events surrounding the handleing of my abuser.
This is because JWs only care about other JWs. Your mother is not a JW and therefore not deserving of any aid.
Hopefully this time off will allow your dad to see just how messed up the WTS is.