Ok, so Dad has a simple 1:30, pin by ring finger - most generic drilling available.
There are many potential balls. The general class might be a solid resin, lightly polished, but there are a few pearl that might also fit in. I'll assume the driller will probably do the same drilling and there's nothing wrong with it, for 99% of us.
I would say try your best to get a 2-3" pin and a 2.5 - 3.5 oz top weight ball.
One again it's just a very safe specification and quite easy to get for most balls.
First ball that pops to mind is one we've bene talking about here for a while, the Track Crunchtime. He'll get easy length, a definite breakpoint and a controlled hook, with good power at the pins.
A solid resin I like a lot is the Brunswick Bruiser. The only proviso withthis ball, is he/you/the driller should take some of the polsih off; do NOT make it dull. Just take some of the high gloss shine off.
Another very good control ball, if you can get AMF, is the Valor/P Tour. It has a low RG, but very small RG differential for low flare. It is a pearl, but it has particles. So, it will hook, but the hook will be smooth and controllable. It should for him, who is probably a stroker, get a very nice reaction. "Should" being the operative word; no guarantees.
Three potential Storm balls are the Hot Wire, the new, Hot Rod Pro Stock, & the Razor Wire. The Hot WIre and the Razor are safer bets; I personally haven't seen enough of the Pro Stock to be definite about it. The HW and the RW will offer a sense of control and decent carry power without too much hook. Both are a definite step down from the Mojo. The Hot Wire has technically been discontinued but most pro shops shuld still stock a few and many might discount it. (These two might be 1/2 a notch less than the other ones I suggested in overall hooking ability and oil handling.)
Less readily available but still very good potential candidates are the
- Dyno-Thane Vendetta Black, and
- Roto-Grip Silver Streak solid.
The Columbia Detour might/should also fit into your needs, but I don't have enough experience with it to make a definite recommendation; others may feel more confidant that it will fit.
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"We get old too fast, and too late, smart."