I would put the son in early, not the daughter late. I’m not sure why they have to be in the same grade. |
I’m not sure what K4 is. OP should put her DS in kindergarten this fall, not next fall. He will turn 5 in September. Then her daughter can go to kindergarten in 2021. |
Depending on the age cutoff, she might not be able to enroll her son for K this fall. MoCo has a September 1 cutoff (and you have to do an evaluation if you want to put the kid in early if you have a September bday). |