if they are together.. .. aren't they cousins if their fathers are brothers

iam totally in to it when I read the summary iam looking forward to this book author to release more chapters😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍