OOD,
Would it be safe to assume that your father, being Orthodox, raised you up as an Orthodox Christian? If so, thank God for his receiving the faith and raising you up in the faith to the extent that he did. If he had, let say, been a pagan athiest, you likewise would have most likely been raised as such.
It is truly unfortunate that a riff has developed between you and your family over your not accepting him as part of the Orthodox faith and "they" who have not respected you and your family's fasting and general way of life.
God willing, perhaps you will be that living icon, full of love, full of humility, that will assist all of you in growing closer together and becoming one in faith.
With humble bow,
Rd. Chrysostomos