Richard

Richard is Jace's father. We know little about him other than Jace gets upset whenever anyone mentions his father, and that his father has a different surname than Jace's "Connors"; all we know about him is the name Richard, which really isn't much to go by.

"Coincidences"
Richard, coincidentally(?) also happens to be the IRL first name of PvtRichardCranium, the troll who plays Liquid Jace and recently started verbally abusing Tyce Andrews via YouTube comments.

This could mean one of three things:

1. Nothing, Just a coincidence. (No evidence points to this)

2. Jace's mother was artificially inseminated with PvtRichardCranium's sperm. (Possible, but not not likely)

Most historians and doctors agree on option number three:

3. PvtRichardCranium had made violent, noisy love to Jace's mother, with thrusts so rapid and strong that the condom broke and was useless to stop Richard's gargantuan pimple pod from spurting massive amounts of man ranch into Jace's mother's axe wound.