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Squirrels can climb just about anything, so you might want to try bird netting. Here are some other suggestions: https://www.gardeningknowhow.com/plant-problems/pests/animals/get-rid-squirrels.htm

It could be tip blight or it could be thrips. Treat the plant with a fungicide for tip blight and a pesticide for thrips. Neem oil is both a fungicide and a pesticide and will treat both possible problems at once.

Not too sure if you want to go at this on your own with the tree being so large (may want to consult with an arborist). However, the best time to prune is in late winter so that you can cut away wood injured by low temperatures. You should also cut back the tall-growing limbs and 1/3 of all new growth. Cut out all dead, broken, diseased branches. Remove old wood as well as crossing or rubbing branches. Aim for a funnel-like shape with fruiting branches about 1 foot apart over the top of the tree.

You have peach leaf curl. This article will help you with that: https://www.gardeningknowhow.com/edible/fruits/peach/peach-leaf-curl.htm

You can plant them near each other, but I would not plant them too close. Pine trees tend to drink up all the water in their surrounding areas, which means the peach tree would have to compete with it for water. Plus, pine trees tend to grow larger and faster than peach trees, and the pine tree could eventually block light to the peach tree if they are planted too close.

In peach trees, this can indicate a root problem. I would check around the roots for signs of root rot. This article may also be helpful: https://www.gardeningknowhow.com/ornamental/trees/tgen/tree-leafing-problems.htm Additionally, some trees, like peaches, may be slow to start if they do not receive an adequate chilling period in winter. Here is more information: https://www.gardeningknowhow.com/edible/fruits/peach/peach-chill-hours.htm