Dina and Michael Lohan are locked in another war of words -- this time over their eldest son, Michael Lohan, Jr.

Dina Lohan told X17online today that Michael, Jr. wants to change his name to "Michael Cameron" in order to "to distance himself from his father of whom he does not speak to."

However, X17online caught up with Michael, Sr. near LiLo's old apartment in West Hollywood this morning, and he told us: "My son is not changing his name. Clear that up!"

Dina fired back, telling X17online exclusively:

    "That's funny. First of all he is not a Jr. and never was. He has been wanting to disassociate himself from Michael Lohan for quite some time. Secondly my son has no contact with his father. Neither does Ali or Cody. And I have a criminal stay away order so obviously I don't."

Apparently Lindsay is the only Lohan offspring who does still have contact with her father, who moved from the east coast to Santa Monica in order to be close to his troubled daughter.

And speaking of Lindsay, Michael told us that she's doing "great," adding "especially with the news that video proved she didn't steal anything."

Check out Michael, Sr.'s exclusive remarks to X17online in the video below.