Parental is related to Family. Family is related to Household. Household is related to Domestic. 
Practice is related to Piano. Piano can be Solid. Solid is a synonym of Substantial. Substantial is related to Important. 
Parental <--RelatedTo--> Family <--RelatedTo--> Household <--RelatedTo--> Domestic 
Practice <--RelatedTo--> Piano --HasProperty--> Solid <--Synonym--> Substantial <--RelatedTo--> Important 