Ditto the above posters and ditto the slow feed haynets - believe me they help. You can get them at Chicks for $7.99 each. My first one is still in daily service and it's over two years old. Saddles Tack Horse Supplies - ChickSaddlery.com Slow Feed Small Mesh Hay Bag
Also the Gray looks on the young side. Even though he looks like he could use another 50 lbs (Paint looks fine:), those bony hips may be there until he matures.
One of my Walkers is Generator-bred and he had those bony hips until he was around 10 years old
You couldn't see his ribs but those hip bones sure stuck out like sore thumbs
If your neighbor's horses happen to be overweight, she is doing much worse by her horses. She's feeding them straight down the path to metabolic issues. It can be a fine line between not-too-fat and not-too-thin.
Standlees makes cubed timothy hay, timothy/alfalfa mix and they also make pellets. Tractor Supply sells both.
You would literally have to weigh cubes or pellets to get the feeding amounts correct. It's one dry pound of cubes or pellets to one pound of hay. After measuring, be sure to thoroughly soak (especially cubes) so nobody chokes