This is my big laminated checkoff list for every possibility (hence the question marks). I have never take it all ( wool hats and suncream for instance and we rarely go seasidey places so rarely need buckets and spades.
Tent
poles
tarp
pegs
delta pegs
mallets
electric hook up ?
windbreak ?
table
stove
gas bottle and regulator
kitchen setup?
canopy(?)
table lantern and citronella candles
footprint carpet?
3 x picnic rugs
fat airics
4 single sheets
sleeping bags
fleece blanket.
inflatable pillows
hot water bottle
chairs
cupboard ?
heater ?
torches
2 x led tent lanterns
inspection lantern ?
spare batteries
cooking pot set
griddle
large slatted spoon
wooden spoon
sharp knife
small chopping board
4 large plates
4 small plates
cutlery
mugs
beakers
bowls (inside pan set)
Wine glasses
paper/felts/drawing stuff
bamboo for M
coins for showers(?)
directions for travel
travel sickness tabs
front pocket for toys in each rucksack
cards/ games
Bucket and spades ?
books
tin opener/corkscrew tool multi tool thingy
matches
fridge
2 j cloths
collapsible bucket
washing up sponge
tea towel x 2
washing up liquid
washing up bowl
Bin bags x 3
carrier bags x3
food bags
foil
2 laundry cubes
washing line and few pegs
Dustpan and brush
toilet rolls (1)
Kitchen roll (1)
wipes
medical kit
neurofen/painkillers
asthma inhalers
hayfever stuff/piriton
tent repair kits
tiny sewing kit
any current medication
tissues
sun lotion
scissors
tweezers
small screwdiver kit
sellotape
Duck tape
camping potty
mosquito repellent/coil
clothes for all
underwear
thick socks
woolly hats/gloves?
sunhats?
thermals?
waterproofs
waterproof trousers
fleeces
wellies /crocs
trainers/shoes/walking boots
micro fibre towels x 4
2x beach towels ?
swimming costumes
wash bags and flannels, soaps/gels etc
toothpaste and toothbrushes x 4
Beach shelter ?