I felt this too, which makes sense because Char was living at home when Grace was in the coma and their mum was looking after the baby full time. I never believed that Lee looked after the baby on his own at any point personally.
This is pure speculation but I get the feeling Char isn’t massively impressed with Grace getting pregnant again so soon while she still relies so heavily on their mum for Cyprus’s care. She’s a very expressive gushy type of person on socials and she hasn’t displayed that energy at all so far about this.
She obviously loves her sister and has defended her in the past but she also clearly sees through Grace too. I’ll never forget during the Lekenah spat all those years ago, and Char jumped in and Lek specifically said, ‘you and I have said the same things about Grace together privately’
, I found that very telling.