this is basic human psyche
gayatri is just concerned abt her family like most ppl
she doesnt care abt ansh and that can be seen in all episodes
she is selfish woman with old thoughts
yash on teh other hand understands relations
he knows aarti is loving and caring and will prove to be a good mom for his daughters along with ansh
he also understands that aarti only married for ansh and not for herself \
he knows what it means if a child is motherless or fatherless
also aarti will never be able to bond with yash's daughters if ansh is taken away from her, if she has to leave him behind
a mother can never leave her kids
gayatri is a typical saas who thinks that she is superior to her bahus forgetting that she herself was a bahu once
for a very long time we will have to see gayatri trying to keep ansh away from all events and the family and favouring her own grand children until hopefully yash will take a harsh step towards it
and her husband will scold her for her beahviour