Re: dua for parents
^ the translation i read was very similar to yours, but the word "mercy" instead of "kind" was used.
Anyways, I learnt at durs that if u (with a sacha dil) make dua for someone who has hurt you (in any way), then the Angels make the same dua to Allah SWT for you.... so we aren't loosing out on anything. Besides, mercy could include anything from forgiveness, bakhshish (after death), hidayat (if alive), etc.
And i get what u r saying... doing dua 4 anyone (especially if it is ur parents) who have hurt u is hard....