I'm 24, fairly new to prepping. I've always been conscious of keeping 1-3 days of provisions, but with the climate of the world I've decided more action is needed on my part if I want to help protect my family. However, my particular situation puts me in a difficult place when I think about planning. I'd like some advice.

Recently, my wife and I have been living in separate households with our families. She had to step in to help at her house as my father in law is regularly away for work and the mother has chronic illnesses and needs help around their large (for our area) property. They have about 3 acres of land with a small 2 bedroom house. They have lots of cats/dogs and some chickens/ducks, as well as a decent creek that runs through the property. Their current household size is 4 people.

Recently, with how much time we have been away from our apartment, we decided it would be better to stop renting and for me to move our stuff to my family's home. It is much 5 bedrooms, but sits in a small suburban development with about .5 an acre of land. With me, the current household size is also 4. My father is decently prepared, with probably \~50ish gallons of water, but not nearly enough food. I'm currently working with him on stocking more water and bulk emergency food. The neighborhood is only \~20 houses, and everyone is very old. We are the youngest family, with everyone else being well into their 50-60s.

My question is, how would you guys plan around this? The houses are about 3 miles away from each other. If SHTF, I know that two more adults will arrive at my home, totalling 6 people in the household.