Maybe nothing…don't know..
Maggie Nixon
Mariah Sunshine Coogan grandmother is Linda Haberstock
Maggie Haberman
stock man..
One article noted that Obama was approaching a buffet on Martha’s vineyard, and while considering what to take asked Maggie Nixon, “What do you like Maggie?” to which Maggie replied, “I like horses!,” making everyone laugh
https://kymkemp.com/2018/05/03/mariah-sunshine-coogan-granddaughter-of-local-woman-instagram-model-memorial/
Berder roughly translates (old english) to "of the same family"