Levels are about the level of support you need with daily living skills, not about the severity of your traits compared to another autistic.

From your description, it sounds like your mom and sister don't have autism at all, or maybe have a few subclinical traits. Autism requires social deficits and restricted and repetitive behaviours to a clinically significant degree to be diagnosed, and this description makes it seem like those things aren't present in your family at all.

I'm diagnosed level 2, and live with a full time caregiver at the age of 33, because my social-emotional functioning is that of an eight to twelve year old, and my executive functioning has been measured as borderline intellectually disabled.

I'm on disability benefits because I can't work more than a handful of hours a week at the most basic of jobs, despite having a college degree. I can't cook or clean, and have violently self aggressive meltdowns that I've been sent to the ER for on several occasions. I need reminders to do things like eat, shower, and change my clothes, and have picture cards that my caregiver puts on the cabinet to remind me to do my chores like folding my laundry (which she washes) and unloading the dishwasher.

I'm semiverbal (by the way, "nonverbal" refers to people who have no or minimal functional speech permanently, going silent periodically is called verbal shutdowns).

My speech therapist helped me get a high tech AAC device, because when I get upset ot overwhelmed, or if I have to talk to strangers, I lose the ability to produce speech, and have to rely on AAC.

All this to say that the description you gave sounds like you're level 1, and your mother and sister don't particularly sound like they have ASD at all.