Describe the family that appears in the photograph!
We can rearrange this a little bit like this:
In this picture, I see a happy family. The mother is hugging her daughter and the son is sitting on his father’s lap.
We use a coma after the first clause in the first sentence and modify the second sentence to include the statement about the mother and father. Sentences should not begin with a conjunction word like "and" unless it is the word, however and after it we would place a coma as well.
Great job with your capitalization and period use...!
Thanks a lot)
You are welcome...