Raise after new baby

Hi Nannies,

My NF had a baby two months ago and starting next week I will be taking care of her. I currently take care of G4, she goes to school until 4pm, I pick her up then stay with her until 7:30pm. With the new schedule I will be taking care of G2m 8am-4pm, then the mom will take G2m and I will care for g4 until 6pm. I won’t be with both kids at the same time, but I will have more duties and responsibilities so my question is, should I get a raise? When I asked the mom about a raise, she said that since I won’t be with both kids at the same time there’s no reason for me to get a raise. What do you guys think? Thanks in advance!