The reason Dan and Phil used to make a lot of "your mum" jokes is because they both briefly had and affair with each other's mum.
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Dan And Phil Jokes
RandomDan and Phil are my children. [Property of Previous Owner: Cecilia] [Credit to Tumblr]
Your Mum
The reason Dan and Phil used to make a lot of "your mum" jokes is because they both briefly had and affair with each other's mum.