家 depicts a house with a pig(豕) inside. Since ancient Chinese was an agricultural society,
livestock was the main property of each family while pig was the most common livestock.
心 is the picture of heart. Ancient Chinese thought that heart was an extremely important organ,
so the vocabulary which bear 心 also imply the meaning about importance.
On thr other hand, heart has been being seen as an organ which dominates human mentality,
心 can be used to describe human mentality.
On the other hand, 頁 is one of the radicals of HanZi, some of the HanZi which bear 頁 as radical such as
頭(head) or 頸(neck) preserve the original meaning of 頁.