Breathe deeply. Check to see if cabinets with hazardous household materials can be locked, or if the items can be moved UP somewhere. Move salt shakers UP, too--my nephew has an odd predileciton for shaking salt into his hand and licking it off? It's either a family thing or a nephew thing, not sure which^^
Crayons, markers and pencils and paper handy for arting, and videos and/or video games for when they don't feel like it. Toys for everyone, teething rings if you've got one really young one? (Put it in the fridge for awhile, they love that!)Breathe.You'll do fine!
Aunties and uncas of the world, unite!^^