The Holmes brothers didn't always have such a broken relationship. When Mycroft comes home from university, he takes his little brother on a day trip to the city. Fluffy little one-shot with Kid!Sherlock and Teen!Mycroft, just a teeny dash of angst thrown in at the end.
Lestrade has always been there for Sherlock, but things get more complicated after the two spend Sherlock's heat together. Omega!Sherlock and Alpha!Lestrade. Omega!verse, meaning smut of the m/m variety, heat, knotting, and eventual mpreg. Don't like, don't read.
Before realizing his feelings for Sherlock, John had been quite the ladies man. But it comes back to haunt him when a baby boy is dropped on the doorstep of 221b. Basically a lot of fluff with John and Sherlock having a baby together. Not mpreg. Eventual Johnlock, so manxman loves. Don't like don't read. Rating may go up.