Well some of the stories in here [link] have all four, (Part two of Miranda's and The 4th of July special.) But each story has at least one of the kids.
If you're looking for something a little more....exciting. I started a sequel to the SFS series called Lineage. It takes place over thirty years after the SFS series.
You get introduced to the kids of other familiar faces, for example.....Gabriel Vakarian, Adopted son of Garrus and Dr. Chloe Michel; or Cassandra'Zorah, Daughter of Tali and Kal'Reegar. You also get to meet the girls all grown up. Fair warning, it's a little dark in places and it's not even close to being done yet. Even gave Aria a daughter, Dawn T'Loak, with Jack XD.
There are also two databases entries in the end of the folder called the Tartarus Mainframe, and the Pantheon Database. You may want to give them a look, as they expand on my stories and give a little more info on the kids and such.