(CNN)Alma Wahlberg, the mother of actors Donnie and Mark Wahlberg, has died, the brothers announced Sunday. She was 78.

"My Angel. Rest in peace," Mark wrote in the caption of a photo of the family matriarch on Instagram.

"My mom Alma's joy for life, love and people -- combined with a pride in her humble beginnings and refusal to forget where she came from -- undoubtedly shaped me into the man that I am," Donnie posted on Instagram.

Donnie Wahlberg's wife, Jenny McCarthy, called Alma Wahlberg "the worlds greatest mother-in-law" on Twitter.

The posts did not specify how she died.

Alma appeared on the Wahlberg family's reality show on A&E called "Wahlburgers," which provided a behind-the-scenes look at running a family restaurant.

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