Does the son sin by not speaking to his father who abandoned him, refused to spend on him and his sister, and wronged his mother?

It is impermissible to abandon one's father or treat him poorly, regardless of his condition, for the father's right is great. If the father is remiss in the rights of his children or wife, the children should advise him gently and courteously, without violence, abuse, or harsh words. If that is not possible, then they should leave him be. Assistance can also be sought from available relatives to advise him and guide him towards good.