Here is a rough conversion of the Familiar from Grand Tome of Adversaries. I've taken a few liberties, removing a few talents that seem superlative now that the creature isn't built from a point allowance.

Least Familiar (Lieutenant)
Fear Rating 1
Hell’s Favor 2
Pace 3
Initiative 6d Reflexes
Melee 5d; Claws (+2 DM)
Ranged 5d
Defenses Avoidance 4 / Discipline 3 / Fortitude 2
Armor (0)
Health Track 6/6/6
Talents
Attack Focus (Claws): Score successes on a 6+
Born Thief: Use Subterfuge as free action.
Cheat: Impose –1d penalty once per scene.
Incredible Reflexes: +2d to Dodge and Parry rolls.
Night Vision: See twice as far in low-lighting.
Powers
Shape Mask: Creature may assume any shape
Invisibility: Creature becomes unseen
Prices
Ultimate Master
Reveal Nature (Mirror)
Skills
7d: Acrobatics, Athletics, Stealth
6d: Notice, Reflexes, Resolve, Subterfuge
5d: Charm, Empathy, Melee, Ranged

Standard Familiar (Lieutenant)
Fear Rating 2
Hell’s Favor 2
Pace 3
Initiative 7d Reflexes
Melee 7d; Claws (+4 DM), Fangs (+2 DM)
Ranged 7d
Defenses Avoidance 4 / Discipline 4 / Fortitude 3
Armor (2)
Health Track 6/6/6
Talents
Attack Focus (Claws): Score successes on a 6+
Born Thief: Use Subterfuge as free action.
Cheat: Impose –1d penalty once per scene.
Incredible Reflexes: +2d to Dodge and Parry rolls.
Night Vision: See twice as far in low-lighting.
Powers
Shape Mask: Creature may assume any shape
Invisibility: Creature becomes unseen
Armor: Adds armor equal to Hell’s Favor
Prices
Ultimate Master
Reveal Nature (Mirror)
Vulnerability (Silver)
Skills
8d: Acrobatics, Athletics, Stealth
7d: Charm, Empathy, Melee, Ranged, Reflexes, Resolve, Subterfuge
6d: Notice

Greater Familiar (Lieutenant)
Fear Rating 2
Hell’s Favor 3
Pace 4
Initiative 9d Reflexes (12d)
Melee 7d; Claws (+6 DM) (10d)
Ranged 8d (11d)
Defenses Avoidance 4 / Discipline 4 / Fortitude 3
Armor (0)(3)
Health Track 8/8/8 (12/12/12)
Talents
Attack Focus (Claws): Score successes on a 6+
Born Thief: Use Subterfuge as free action.
Cheat: Impose –1d penalty once per scene.
Incredible Reflexes: +2d to Dodge and Parry rolls.
Night Vision: See twice as far in low-lighting.
Powers
Shape Mask: Creature may assume any shape
Monstrous Form: Adds Hell’s Favor to physical abilities
Suggestive: 7d; Control the minds of others. (Roll vs target Discipline)
Prices
Ultimate Master
Reveal Nature (Mirrors)
True Name
Skills
10d: Acrobatics, Athletics, Stealth
9d: Reflexes*, Empathy
7d: Charm, Melee*, Notice, Ranged*, Resolve, Subterfuge
6d: Command
*add Hell’s Favor when in Monstrous Form.
Figures in Parenthesis reflect creature in Monstrous Form.