How bad is it to default on rent?

I plan on paying my dad less than 25% what I usually pay him each month due to credit card demands. My dad will never hit me or punish me but he might yell at me and be rude for a few days or months. My mom doesn’t love me and would want my money even if I was homeless but I told her if she treats me bad, I will ignore her when she is old and too weak to take care of herself. She is dying right now so she has to at least pretend to love me until she is dead to make sure she has access to my help.

How bad is it to default on rent?
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