I cannot stop thinking about what father told us about those horrible incidents that happened in these few weeks.

Please correct if there's any mistakes in it. Thanks ^o^
Hello again,

When you say father instead of my father you are using
the word father in place of the person's name, so it is capitalized.

I made a few changes in your sentence.
It might be better this way.

I can't stop thinking about what Father told us about the horrible incidents that happened during the past few weeks.
Many thanks for helping, Trellis! ^o^