The birth of Karan Johar's twins, Yash and Roohi, is the most talked-about topic in the tinsel town now. But very few know the complications, which the little toddlers, Yash and Roohi faced as they were premature babies. The 'Ae Dil Hai Mushkil' director named his newborns after his parents - Yash for the baby boy after his father and Roohi, as an anagram of his mother's name Hiroo. Now, KJo has written an emotional note, thanking the doctors behind the complicated delivery of his twins, who were born through a surrogacy. Karan took to his twitter account, and captioning the note, said "My mother and I remain eternally grateful from the bottom of our hearts for all the love and care that were given to Roohi and Yash Johar. Earlier, Tusshar Kapoor too became a single father through donor egg surrogacy.