It can really take a while. A child has to be exposed to certain foods many times to be willing to try. Also remember their senses are a lot stronger than ours. Things can have a very strong odors and taste, not matching what you smell and taste.
Continue to add pureed, but also just keep offering the veggies and fruits on the side and you and your husband continue to just eat them in front of the kids. Do not make a big deal out of it.
Have you heard about my "Brave Taster " strategy.?
Make a chart for each child. Each time they take and eat a new veggie, fruit, or food they normally would not eat, they are given a sticker to place on the chart. After they have acquired a certain amount (you decide) they can choose a prize, activity or be able to pick a place to eat of their choice.
Again, once you explain it to them, it is up to them to taste.
Include them when you are prepping the veggies. Have your 7 year old, learn how to peel fruits and veggies (I do not usually peel them but do this to include your child). Give the 4 year old a plastic knife to slice soft or cooked veggies it will allow them to feel like part of the process.
Maybe make an apple pie with the 7 year old helping peel. Add blueberries that your 4 year old has counted out..Have your 4 year old help with the dough. Give them little aluminum pie pans to make their own pies with fruits.. Encourage them to try the ingredients.
Make banana nut, zucchini or carrot, fruit breads or muffins, again get them involved all through the process and then they will see how good it tasted and smalls as it bakes.
Hang in there.