Do you have any kind of BBQ - gas is best but even charcoal works, to heat water in a pot on the grill while the coals go properly ready to cook, and then cook as normal BBQ, but also use tin foil parcels or even camping or proper pots on top of the grill for things with sauce etc.
Do you have any kind of light at night? Camping forces are handy, a headtorch around a large clear or opaque bottle filled with water and turned inwards to shine through the water makes a surprisingly effective lantern.
If you have a way to burn them safely, in a room that you are not leaving and not in a draughty, candles can be good for light and also to add extra heat. Especially if you don't have an open fire or stove. A gas heater (a modern "super ser" ) can also help, or a hot water bottle under a blanket. Certainly try to limit yourselves to 1 or 2 rooms only and close doors to other rooms to keep as much heat in 1 place as you can.
Also wear layers to keep warm, and a hat indoors to keep heat loss to a minimum through your head.
Buy a hot rotisserie chicken for dinner, eat it with salad and crunchy bread.
Do any neighbours have a bbq, gas cooker or similar that they can heat water for a flask for you, or cook some food for 1 meal even if not all 3 meals of the day? If anyone has a gas oven, can they fill it with things for a few people to make the most use of the gas when it's on?
Is your local swimming pool/gym open, that you could have a shower there (for the relevant fee)? Or a hotel room if you have the funds (they may be willing to do a cheap rate for a couple of hours in the daytime to let the family get clean and warm if there are lots of people with no power, turning it over a few times in the day for a few families).