Case of family retaining no memory – weird, if you ask me (3,2,5)
I believe the answer is:
for my money
'if you ask me' is the definition.
(both can mean 'in my opinion')
'case of family retaining no memory weird' is the wordplay.
'case of' means to remove the middle letters (outsides of).
'retaining' is an insertion indicator (inserted letters are held or retained).
'weird' indicates anagramming the letters.
'family' with its centre taken out is 'fy'.
'no'+'memory'='nomemory'
'nomemory' is an anagram of 'ormymone'.
'fy' going around 'ormymone' is 'FOR MY MONEY'.
(Another definition for for my money that I've seen is " If I were to express an opinion ...".)