If you like yellow and wanted a coordinated , bright and fresh look for your lounge OP, you could consider something like these curtains with matching cushions and a matching feature wall. You can even get a table runner and could add plants and some homely touches. www.spoonflower.com/en/home-decor/living-decor/curtains/10676704
I suggested this because yellow is a happy colour and would feel positive to viewers, but there are really any number of possibilities.
This rabbit is so cute! www.giftsfromhandpicked.co.uk/novelty-and-fun-gift-ideas/heaven-sends-bristle-rabbit-easter-home-decoration.html and would be appealing to kids and make adults smile too (it's a family home)
This is a really cute thing you could make with your kids and it would lend a real charm to your house, making it feel like somewhere people could "nest" www.pinterest.co.uk/pin/703756168635699/ If it's a family home, you want it to look like a happy place for kids.
I'd go for beautiful flowers that pick out your decor colour such as these (if you even like yellow) www.pinterest.co.uk/pin/13088655149557128/
Ultimately, your living room needs to look like it's for living in, spending fun time in , somewhere people feel could be a happy place for the family. I'm not an expert, but I'd focus on having fun with your kids and letting it show. At the moment the lounge looks like no kids live there.
If you don't like yellow, I'd suggest you pick a different color and design of curtain, cushion and table runner with matching wallpaper to give your lounge a coordinated lift. You could add bouquets of catkins, cherry blossom or other spring flowers to really bring out the colors of your chosen decor. A few pieces of art in your chosen colour would be ace.
Focus on making it feel welcoming, like when you go to an Air B&B and theres all kinds of imaginative touches that make you smile and feel happy and relaxed immediately.