Proving that Jason Todd’s life is one of the most tragic events in DC's history, his mother manages to give him up to the Joker, and thus is directly responsible for his awful, awful death.
Did we mention he was trying to save her life at the time? Because god, does it twist the knife that little bit more.
Shelia is a complicated character in terms of parents, because her grief after realising her son was dead – and her dying words to Batman, about how she regretted what she did, and cared for her boy – do make you feel a little bad for her.
As much as Shelia wasn’t a good mother to Jason, it’s clear that under different circumstances – or at least while not being blackmailed by the Joker – she could have been.