Where have you looked for information so far? If he is an uncle, have you found profiles for his sibling/s yet?
Have you started building upwards to where he fits in the family?
If Kerrigan-540 and Webb-13888 are your ancestors, can you create (or find) the linking profile/s so they are directly related to you on Wikitree?
If your parents don't already have profiles, you should start with them, then look for their parents. If your grandparents don't yet have profiles, then you can create them. If they do have profiles, you should be able to link them to your parents. And, thus, it begins. (The obsessions - with rabbits. )