Love match - What's the best way of breaking it to the parents?

Re: Love match - What’s the best way of breaking it to the parents?

And they are:

Shirk in Worship - accepting anyone/ thing other than Allah, as being worthy of worship.
Shirk in Personality - considering any other being equivalent to Allah.
Shirk in Attributes - considering another’s attributes similar to the attributes of Allah.

No matter how you try to spin it, knowingly committing Zina is NOT SHIRK and therefore not unforgivable.