Feel like I’m a viral TikTok ☕️

I’ve seen those “what’s the family tea you learned..” videos and now I’m living one as a reality. My dad raised me and my sister on his own since I was 2 until my step mom came into our lives 4 years later. We would still visit my biological mom every other weekend but it was always very toxic with her. My dad passed away tragically when I was 15 in a motorcycle accident and it has caused a lot of trauma for me as an adult. Anyways, yesterday my bio mom and sister let it slip (as a joke) that my dad may not really be my dad. My mom and dad separated briefly before she got pregnant and they both slept with other people. My sister and step mom have known and no one ever told me. My dad and step mom used to make “the mail man’s kid” to me because I don’t look like my sister, I always thought they were jokes until now. I’m on a mission to find out which DNA test kit to use that would be the most beneficial in figuring this out. I’m devastated and having an extremely hard time. I just needed somewhere to vent xx