I don't make it out to San Fernando all that often (though my childhood favorite Mexican restaurant was Sierra's -- I grew up in the North Valley.)
But my son had a game in Sylmar yesterday and we cruised Maclay Avenue looking for a place to eat breakfast after dropping him off for warm ups.
We stumbled upon El Abuelo (452 North Maclay Avenue) after crossing under the bridge and going from Sylmar to San Fernando. We got there right at nine when they opened.
Really want to recommend this place, though it's a rec based on one meal. I had huevos a la mexicana and my wife had huevos rancheros. Everything tasted very, very fresh -- the mexicana had the right amount of peppers, good heat.
The tortillas were home made, a highlight. I didn't try my wife's breakfast, but she was very satisfied (and she orders HR whenever possible.)
The place is clearly family run and families are welcome. By nine thirty they were doing good business with lots of well-behaved children at several of the tables.
I'm going to drag my folks there next time we go visiting. Might be worth a try for those out in that neck of the woods.
BTW - San Fernando is one of the most charming neighborhoods around. Like parts of Playa Del Rey, it feels like it hasn't changed much over the years. I'd bet there are a few other spots out there worth trying.
BTW2 - The only other reference to El Abuelo on CH was for the pozole. I saw several people trying it, along with the menudo.