All the above advice is great. My little extra is that the Meade series 4000 eyepieces are great value and should not be overlooked. After saying that, think about sitting on your hands for a while and letting your father get to know his scope and then he will make better discissions regarding other eyepieces and upgrades.
As for the Telrad, it may be worth setting it up alongside the finder scope, if you already have one, so either can be used. I had mine set up like this for a long while before taking off my finder scope but in light polluted skies it would be worth keeping both.
It may be worth making a cardboard "dew shield" to keep the stray light out of the scope before any other upgrade.
Finally, just keep the scope bog standard for a couple of months then start making informed descisions about the upgrades.
Good luck.
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