These are branches on the neighbors side? Tell him to hire someone to trim it back.
But he should be made aware that ants aren't scaling a (living) pine tree to access his house. They're ants.
yes, had same issue. Ants climb trees, wires, etc and can end up on the upper floors of your home. All branches touching the house should be cut back. You can use something similar to the below if you can reach branches.
http://www.amazon.com/Fiskars-Power-Extendable-Pruner-94616935J/dp/B003TJ9GAO/ref=sr_1_5?s=lawn-garden&ie=UTF8&qid=1437408846&sr=1-5&keywords=extension+tree+trimmerThis definitely happens. Buckingham did something around the trunk of one of our trees (near the ground) because we couldn't just trim, since the ants were getting from the tree to the power/phone lines and then getting to the house on those.
The portion of a tree that is in your neighbor's property is your neighbor's property. He/she can clip those branches to his/her heart's content. It doesn't matter that the tree originates on your property. It's fine to coordinate how the tree serves or disserves your common interests, but this seems like a matter only concerning your neighbor. If cutting the branch would cause the tree to be unbalanced, then you will probably be concerned. Otherwise, not.
About 10 years ago, had some landscaping done around our house. At that time, the guy planted a small pine next to our neighbor's house. Well, the pine is now up past the roof of the neighbor. Today, the neighbor was complaining about ants and thought they might be coming in off the pine tree. Does that make sense? If we wanted to trim back the tree and try to contain it, who do you suggest for estimates? Can't afford much.