In the hour-long episode, fans were left confused as EastEnders cast Sonia Fowler (Natalie Cassidy) referred to Max Branning (Jake Wood) as her uncle.
Max went to Sonia for advice following the news that his daughter Abi Branning (Lorna Fitzgerald) was declared brain stem dead.
But as the pair discussed Abi, fans took to social media to share their confusion at their family link.
BBCRELATED: Fans forgot that Max is Sonia's uncle
BBCMUM: Sonia's mum Carol is Max's sister
Viewers were convinced that Sonia had only recently started calling Max her uncle, and questioned the sudden referral to their family tree.
One posted: "When did Sonia start calling Max, 'Uncle Max?'"
Another added: "How is Max 'Uncle Max' to Sonia?"
BBCDEATH'S DOOR: Both sisters are still in hospital
A third chipped in: "Totally forgot they were related, I’m not sure Uncle Max and Sonia have even shared a solo scene together till now."
Max is the brother of Sonia's mum Carol Jackson, whose dad was the late Jim Branning.
This makes Sonia Max's niece, and cousin to Lauren and Abi Branning.
BBCDAD: Jim was father to Max, Jack and Carol
Jack Branning (Scott Maslen) is also Sonia's uncle, which was referred to last night too.
EastEnders is full of surprises isn't it?
It continues tonight at 7.30pm on BBC.