Although it is well known that Vladimir Putin is divorced and seeing a gymnast named Alina Kabaeva, he has had two daughters by his ex-wife Lyudmila, a former airline stewardess. The girls were born in 1985 and 1986 respectively and are now in their thirties.
Both girls went to school under assumed names and were carefully shielded from the spotlight. Because both are wealthy, after the invasion of Ukraine, they were sanctioned by the U.S. and its allies. It is suspected that Putin has showered the girls with large amounts of rubles, making them suspect as oligarchs in their own right.
You can read up on them and see pictures at this highly entertaining website.