Working away from his parents' house and wishing to take his sons with him but his father disagreeing
A:
If your father has other people to serve him as you mentioned that your mother and sister are living with him, there will be no harm if you take your wife and children with you to the city where you work while paying a visit to your father every now and then, for the Prophet (peace be upon him) says,
There should be neither harming nor reciprocating harm.
And he (peace be upon him) says,
submission is obligatory only in what is good (and reasonable).
You should try hard to have his consent and supplicate to Allah for him that He might guide him to what is best. May Allah set right your affairs and that of all Muslims and guide you to what is good.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.