I had a similar quandary recently, but the commute would have been Newcastle > Liverpool.
I really had to think long and hard and eventually decided not to... in my heart I knew it wasn't practical, and I didn't want to be in a position where I'd have to leave them in the lurch.
It went against all my instincts, but it was the fairest decision for them.
(Note: if there had been a big tour or something at the end of it, the outcome might have been different, but it was all a bit tentative.)
YMMV etc.