I think Asa looks drained more and more. The care required to look after Abbie is a 24/7 job and he only shows us a fraction of what really goes on. Who would want that job and they are both only young yet, wait until they get older and see how they manage then.They don't work hard but I do think it is exhausting taking care of Abbie and dealing with her 24/7. I think it would wear anyone out.
(Not saying this to bash Abbie or as a slam against her. Just that with the intensive level of care and supervision Abbie requires - that can be tiring.)