Just measure both the dc!
Dc1 is 5f2 (and a half) 
Dc2 who is a couple of years younger is 4ft5
I seem to have grown giants lighthearted
I know both of them are tall but still I’m 5f9 (and a half) and dc1 only has to grow another 7 inches and will be the same height as me….dh is around 5ft11!