How can I help my parents increase their wealth? We are a family

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How can I help my parents increase their wealth?

We are a family of four - mom, dad, sister, me. Both my sister and I are in college where my sister is in a state university and Im in a CC. I pay next to nothing while my sister has most of her tuition covered by fafsa aid.

My dad works an 8-5 driver job and makes around 35k a year. My mom mans a food truck business with the family helping out from time to time when we can. For the past 2 years, my mom - with the help of us - has pulled in roughly 60-70k a year and this is with all expenses of the business included. Her food truck business doesn't impact our college financial aid surprisingly enough due to fafsa giving small business families a break which is nice.

In total, my parents make roughly 90k a year which is decent for them. On top of that, we live in a cheap house and have a smaller back house that's rented to a tenant who's been living here for a couple years. The rent we charge him pays off 80% of the monthly house payments. Overall, my parents have a couple 10k in "savings" - a good chunk is under the table while some has been put in a savings account - and dont have too many expenses other than a new car and a new family phone plan.

I want to help my parents manage that money a little bit better and have them earn more income. What can you /biz/raeli's offer in terms of advice? My parents aren't finance literate so Im guessing the first step is to teach them the basics. I dont know much myself which is why Im asking