Hi Jesabell
sounds like you have a lot to do. It is hrd to make time for each child, the older 3 are fairly close in age. Do they have activities that they do that you could do with them, maybe when your little one is in bed? Maybe you can do something creative with them, like scrapbooking pics together?
Life is so busy but sometimes we need to stop and smell the roses, make the time to have special experiences with our kids.

Hope you get some quality time together