I'm scared I'm not my father's child, he would be okay to get a paternity test but I don't want to cause drama in the family, what should I do?

My mother cheated on my father, I have recently made a discovery about my brith that gives me doubts about being my father's bio child. I'm very much like my father, mentally but only slightly physically. In ways that change through life. I'm scared I'm not his. I love him so much and we would both be crushed if this was the case but it's just little bits of doubts at this time. Should I ask my father for a paternity test? And should I urge my siblings to get one as well?