So 2 possibilities they either made a mistake or kshitij mom n akash moms last name is nimbalkar n kshitij chose to use moms last name instead of dads last name
I think akash n kshitij r cousins if mavshi is mom of akash n then both women chose to use their maiden name instead of their husbands name
But then if they are not purudand then why mb took avnis life ?
Also its possible vaiiju is next in line cos in gargis dream she never saw vaijju n other kid was also different maybe thats mrunmayee?