Need help with finding my great grand fathers parents Mull

Hendrik Johannes Nickolas Mull, married to Maria Mull (born Swanepoel.)
Dates that I could find, he was born 1888 died 1917.
3 kids
1 died very young
Christoffel THeodorus Mull - Anna JMC Mull (Myburgh)
2 daughters

Hendrik Nicolas Mull.- married twice

I hope there is some one who can help me.
Very much appreciated.
Nicki Gouws