I am sorry to report that indeed Marlo Thomas is married to Phil Donahue and has been for more than 20yrs.They met on his TV show and it was love at first sight for them both they have said in interviews.
As for Merv Griffin he never remarried but he was seeing a lot of Eva Gabor before she passed away.
He was a great Talk show host and I use to throughly enjoy his afternoon show.He was a briliant business man and I am sure he will be missed by his family and friends.
PF