Sei He Ki in Chinese / Japanese...

子を持って知る親の恩 literally translates as: Only after you have a baby, you would appreciate your parents (feel the way they do, etc).

This is a bit like the “walk a mile in another man's shoes” saying. Basically, it's about you cannot fully understand the plight of others until you experience it yourself. It also shows appreciation for the plight of parents.

This Japanese proverb can also be translated a few more ways:

No man knows what he owes to his parents till he comes to have children of his own.

One knows not what one owes to one's parents till one comes to have children of one's own.

Only after you have a baby, you will appreciate your parents or feel the way they do.

Only after becoming a parent yourself do you realize how much you owe [how indebted you are] to your own parents.

Note: Because this selection contains some special Japanese Hiragana characters, it should be written by a Japanese calligrapher.

黑旗門 is often romanized as “Hek Ki Boen” in Cantonese, this is the title for a certain branch school of Wing Chun or Eng Chun martial arts.

気剣体一致 is the title Ki Ken-Tai Icchi.

気 = energy, 剣 = sword, 体 = body, 一致 = synchronization/unity. So, “energy, sword, and body in unison” would be one way to translate this. Sometimes written with the possessive article, の, making it 気剣体の一致 or “Ki Ken-Tai no Icchi.” Let me know in the special instructions if you want that の character added by the calligrapher.

糸東流氣目館空手道 is the title for Shito-Ryu Ki-Me-Kan Karate-Do.
A school of Karate.

Note that while this title can be pronounced in Chinese, it only makes complete sense in Japanese.