My dad and I have a good relationship and I told him I really wanted to boost my credit because it’s a 670 and I really would like it to go up because I am moving to a new apartment in 6 months. He told me the fastest and best way to boost my credit is to get added to his credit card. He has an 800 credit score. But I have some concerns. I feel like these might be dumb questions but I need to ask someone anyways.

We have a good relationship only because I keep my private life private from him. Would joining give him access to my other credit/ debit cards? For example would I be like totally connected financially to him or just via that one credit card? It’s though FedEx but we both have private cards through regions. Would he be able to see my transaction on my regions card? I know he would when I use the FedEx card obviously. But I am wondering what all happens and he has access too if I become apart of his credit line? Thanks.