Advice needed for mother plant

Mother plants can become root bound after a while of being in the same pot. If you dont want to take cuttings and start a new mother root pruning is a good option. You can take the plant out of the pot and take a serrated bread knife and shave off an inch from 4 sides and the bottom of the root ball. Add more soil the the pot then replant.

If they've been in the same pot for a very long time (relative to size of pot), then you'd probably be best regenerating them. Take healthiest cuts and re-pot once they grow... toss out old or flower them.. yellowing from tip-in and from bottom-up is possibly N-deficiency. The curling up of the leaves is possibly heat. lacking info, so take these suggestions as a grain of salt and consider the context you ar familiar with.