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Can a swarm monger cast reduce person on their familiar and then make them swarm?
"As a standard action, a swarm monger can cause her familiar to burst forth into a full swarm of identical creatures, filling four contiguous 5-foot squares and gaining temporary hit points equal to half its master’s maximum hit points. While in swarm form, the familiar loses the improved evasion, share spells, deliver touch attack, and scry on familiar special abilities. It uses its normal AC, saving throws, and skill bonuses, and it gains the swarm subtype and the ability to make swarm attacks (dealing 1d6 points of damage at 1st level and using the swarm monger’s druid level as the swarm’s Hit Dice to determine damage increases as per the swarm subtype). The swarm monger is immune to her own familiar’s swarm attack."
One issue is share spells is lost in swarm form (see above) and this is what lets you cast reduce person on them "A wizard may cast spells on his familiar even if the spells do not normally affect creatures of the familiar's type (magical beast)."
Still, what happens if you reduce the familiar in size first (when share spells is active) so that they get smaller, and then swarm the familiar?
The archetype explicitly calls out it doesn't work.
The archetype calls out that the familiar cannot be reduced when in swarm form, this situation is that it has been reduced before turning into a swarm.
That statement clearly parses into the fact that you cant turn a reduced familiar into a swarm.