Ok yeah your mum has me beatI can beat that... Or my mum can! She had a kid with a guy, he then went and had another kid with another woman. My mum then had a kid with a different guy... Guy goes off and has another kid with the second woman.
My half sister's half sister, has a half sister who is also my other half sister's half sister.
Currently sat on our friend's sofa counselling her through the middle to late stage of separating her marriage and sorting out finances and planning divorce etc. Fun times.