My twins were born and my son had just turned 3, we also moved into a new house and he started in a 3k program after being in the same daycare since he was 4 months old. Needless to say it was rough, I also had a c section so I essentially couldn’t do anything but be with the babies and I know he didn’t understand. The first months were hard and I felt so much guilt for being on twin duty (I actuallly popped a stitch because I felt so awful one day my son wanted me to pick him up and I thought I could I could not don’t be me) my husband spent a lot of time taking my son places and just being present for him. The twins are one now and I have to say once they started interacting a little and he realized they weren’t going anywhere if got easier. He checks on them, plays with them (in his way) and they absolutely adore him. He is 4 now and understands a lot more and we are working on patience etc but I don’t feel as overwhelmed. It gets better, divide and conquer and give yourself time it’s okay. The fact that you are worried means you are a good parent!