Your family feels that you are being taken advantage of by your DP
Your family is worried that DP is a scrounger, a good for nothing, lazy, a deadbeat who is living a life which you are providing ALL the money for
What do THEY want you to do?
I imagine your family would be happier if DP worked and was providing something to the monthly income of your household
I imagine your family want you to make him get a job, insist, coerce, give an ultimatum
Of course you don't HAVE to do that if you don't want to and you can ask your family to STFU and if they don't......
you can stop seeing/talking to them
Are you truly happy being the only breadwinner? Would you feel more respect for your DP if he got a job , any job, or if he started regular voluntary work which could lead to paid work ....eg Citizens Advice Bureau?
Be honest with yourself, OP. You don't have to be honest here, but be honest with yourself.
My sister was in a VERY similar situation. She wasn't honest with herself. She made all sorts for excuses for her DP. It was DREADFUL to watch her fool herself about that man. DREADFUL. It made us feel so so sad.
Eventually, after many years of her providing EVERYTHING, my sister saw the light and they split up.
Her DP took a shed load of her money in the split (after providing nothing to the household for years) and she just let him 
But at least she is now free from the scrounging freeloading twat