Will my family experience the same as what I did to my uncle's wife, despite my sincere repentance and extreme remorse? And how can I get rid of masturbation and watching pornography?

What you did involves major sins, such as looking at a non-mahram woman with lust, touching her, and being alone with her. Your uncle's wife is a non-mahram; she is not unlawful for you to marry. You must repent from these actions, from watching pornography, and from masturbation. Your fear that your family might experience something similar is valid and can be remedied by sincere repentance.