well i think so too.
seems like the grand father helped simran and he knew
simran and suri are best friends, that's why he brought the child to their home without telling all the actual story
he knew his wife has big mouth and won't really support him nor let them raise this child., keeping this secret, maybe simran doesnt know about it, maybe her parents gave away the child and he saw it and save the baby from such life, or as he said found her some where and brought her but the big chance is that he knew who''s child it is..
maybe simran think her baby was dead. but her husband knows her past that's the fact we can see here.
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