Yes, if your mother comes out as lesbian, then you must disown your mother and never speak to her again until she dies, because she has declared her hatred for the Word of God and for God’s Creation by declaring herself as a homosexual.
If you love your mom more than Christ, then you are not worthy of Christ. Your choosing to love your gay mother will mean your rejection by Jesus Christ, who hates all homosexuals.
God will be torturing gay people in Hell for ever and ever.
Hell is a place where God shows His hatred for gays and unbelievers by torturing them without any chance of redemption. God shows NO GRACE to those who are in Hell!
You should disown your gay parents, because this is the right thing to do as a Christian.