Lois Patrice Pewterschmidt (renamed Lois Griffin upon her marriage to Peter Griffin) is the main mom in the Family Guy series. She was also briefly known as Lois Quadmire upon wedding Glenn Quagmire in "Meet the Quagmires". In a past life she was known as Lady Redbush.
In s2e1 "Peter, Peter Caviar Eater" her left shoe is removed, revealing her left foot.
In s3e7 "Lethal Weapons" she is barefoot whenever she's shown at the Jared Fellow's Tae-Jitsu.
In S3E10 "A Fish out of Water" Lois is barefoot (and holding her shoes) while exiting a Hooters after indulging in a beer bong.
In S4e22 "Sibling Rivalry" while Lois claims to be a private schoolgirl who needs to be spanked, Peter claims he is a Paladin with 18 charisma and 97 hit points who has a Helm of Disintegration and does 1d4 (one roll of a four-sided die) damage as his half-elf mage wields his +5 Holy Avenger.
In S5E13 "Bill and Peter's Bogus Journey" Lois is cleaning her right shoe, revealing her right foot.
In S12e10 "Grimm Job" Lois (playing Cinderella) is barefoot towards the end of the "Cinderella" segment.
In S12e15 "Secondhand Spoke" she is barefoot while chastizing Peter about his smoking in bed.
We need the actual episode numbers or titles for these
These may all be from different episodes: