The kanji 辛 used as a component.

The kanji 辛 has the well known kun-yomi of から・い meaning spicy or hot.
Furthermore, the on-yomi is sometimes used in words seen in cooking recipes like
香辛料 コウシンリョウ with the meaning of spices (aroma and spicy ingredients)

When trying to remember this word I noticed this on-yomi of SHIN made me think of some other characters using the same on-yomi like 新(new) and 親(parent) which looks pretty similar to 辛.

When checking out the components on KanjiABC I found that the only common characters with the on-yomi of SHIN and the 立  as a component is the ones mentioned 辛新親 and also 薪(たきぎ) which means fire-wood. So maybe the left component of 親 and 新 is connected to 辛.

According to Zhongwen.com the left part is a combination of 辛 and 木 which give the meaning of wood that hurts.

That means the supposed etymology for 親 is then on-looker and punisher for wrong-doing or the one looking and correcting what was wrong 辛 was the role of the parent and 新 probably meant a newly painfully newly cut wood.