He is the co-founder and former leader of the Movement of the Revolutionary Left (MIR) (Spanish Movimiento de Izquierda Revolucionaria) along with Miguel Enríquez.
The last known MIR-document in which Bautista Van Schouwen had personally participated was the situation-analysis of December 1973 authored by the Secretariado of MIR (the MIR executive committee, led by Miguel Enríquez).
He is married to the journalist and sociologist Manuela Gumucio, daughter of the former parliamentarian Rafael Agustín Gumucio and ex-wife of the general secretary of the Revolutionary Left Movement (MIR), Miguel Enríquez (d. 1974).
He married the lawyer Raquel Espinoza Townsend with whom he had four children: his youngest child Miguel Enríquez (1944–1974) followed him into the field of medicine and became the legendary revolutionary figure who founded the MIR and headed the resistance against the Pinochet dictatorship.
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Two of his sons Miguel Enríquez, and Edgardo Enriquez along with his ex-son in law Bautista van Schouwen (all three leading members of the MIR) were assassinated in the first period of the Pinochet dictatorship.
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During the second half of his high-school studies he met Miguel Enriquez and Marcello Ferrada-Noli.