Rosalind Potter was Harry Potter's older sister and she was the bestfriend of the Weasley Twins since first year. Rosalind and Fred dated in sixth year after the kiss in a kayak at night off curfew, it was Fred's idea.
Now Rosalind and Fred were in seventh year and they're both engaged and you were born, you were a 2 year old boy, you got some ginger hair and those beautiful dark green eyes you got from your mother.
Right now Fred and you were outside, playing in the mud and you were barefoot and you threw some mud at Fred and you were belly-laughing because of your daddy being a mess of mud while Rosalind was in The Burrow with the others.
"The thing I would do to hear that laugh."
Fred said with a chuckle, you were both a mess of mud, but the clothes can be washed, the memories can be forever.