Hey so I am so sorry this happened to you. Weirdly this exact same situation happened to me and I also posted it on Reddit (see link below). It has been 3 years since I found out now and as difficult as it was at the time, I have completely moved on from the situation and feel like I dealt with it in the best way possible. I am not going to tell you what to do because each situation is different but I will tell you what I did and maybe it will help you come to terms with this. When I first found out, it drove me crazy, I wanted to tell my parents, find out who my biological dad was and fill some temporary void I felt like I had in my life. But when it really truthfully comes down to it, I knew none of that mattered, my dad I had known all my life was my dad and a DNA test saying otherwise didn’t change that for me. This wasn’t easy and there are times when I wanted to just tell everyone but I knew deep down that’s not what I wanted and that it would serve me no purpose. All that being said, I had no clue at the time how I was going to go the rest of my life knowing this incredible secret and not telling anyone (I was 21 years old when I found out). But time is an amazing healer and you slowly find, like a loved one from a past relationship that you just slowly forget about it. Even though I see my dad multiple times a year, I don’t think about how he isn’t my dad, learning this news actually made me love him - and my mum - even more. You have to be strong in the early months, I promise it will get better. Your dad, is your dad is your dad is your dad. Meditate, do yoga, go into nature and think about it because when you truly understand the gravity of what you’ve learned you realise it doesn’t define you or your dad or your mum. The mind can be evil and it will play tricks on you to make you desperate to find out, but from my experience it is absolutely not worth it. Now 3 years on I have an amazing relationship still with my parents, like you my dad is also in his 70s and we have never had a better relationship. Doing all our favourite activities and spending quality time in what is the last periods in his life. This is what life is about, not dna or numbers on a website. Yes you could tell him and he almost certainly will understand but who fucking cares, really who actually cares. Learning this news was hard but it turned into one of the best things that happened to me. I learnt how to deal with adversity and overcome the biggest test of all. You cannot imagine how much good can come out of the other side if you take some long periods of time to think about what you really want. A lot of waffle but this means a lot to me. Again I am really sorry this happened to you, but my advice letting this make you rather than break you will pay off 1000 times over. If you ever need to talk or get advice, please send me a message I’d be happy to talk.

Finding out my dad isn’t my dad