Jojo. His full name is Bartholomew Jojo Simpson.
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Her middle name is Ann.
The simpson's son is called Bart or very rarely called Bartholomew which is his christened name
Once you get Bart's Tree House at level 12 you'll unlock Bart.
'Marge's Son Poisoning' (episode 5, season 17).
Hugo Simpson is supposedly the Siamese twin of Bart in Tree house of Horror VII. (But Bart doesn't really have a Siamese twin on the real show, just on that tree house of horror episode.)