Mark Pines

Mark Pines is Dipper and Mabel's father. After Dipper becomes Alcor, Mark becomes afraid of what he could do, but that never takes the place of the love he felt for him. 

History

Mark is a loving parent to the twins. After the Transcendence, he begins to doubt his ability to be a proper parent to Dipper, given that he can't see or hear him. When the twins are in their mid-teens, Mark and Anna agree to send them to live in Gravity Falls, where they think they'll have a better life.

Relationships

His relationship with Dipper and Mabel varies as the kids grow to adulthood. Sometimes they get along fine. Other times, there are periods where things are very tense and they do not talk as much as they once did. This happens more after the triplets are born.

While he still loves Dipper and Mabel very much, he does not handle Dipper's change very well. He is scared of his own son as well as scared for him. He doesn't understand what has happened, doesn't know how to adjust to it, and can't figure out how he can possibly be the parent he wants to be to someone he can't even see or hear or feel the vast majority of the time.

Mark is also extremely worried about Mabel and the stress that dealing with Dipper all the time can put on her, such as the bullying she faces at school in Piedmont.

He and Anna send the twins to live with their Grunkle Stan. This is not because he wants Dipper gone, but because he believes the twins will be happier there.

Personality 

Mark is a caring man who wants to be a good parent, but struggles to deal with Dipper's predicament and winds up hurting the twins. This is always unintentional, as he never purposely does something he knows will hurt Dipper or Mabel, and often regrets the mistakes he knows he has made. He feels as if he's failed as a parent. Despite the tension, he's constantly trying to do what’s best for his kids.

Mark loves Dipper and Mabel.

But sometimes love isn’t enough.