Don't even speak to Father again after completing 'Institutionalized.' DO NOT complete 'Synth Retention.' (Give holotape to Sturges.) You may safely complete 'Institutionalized,' but do not progress any farther before getting yourself kicked out. You can play along and poke around for a bit first if you like, but if you do, you'll have to murder someone to get banished (might we suggest those ♥♥♥♥♥♥♥s down in synth retention?). (c) Get yourself banished from the Institute. Use the Minutemen to gain access to the Institute. (b) Focus on the Minutemen as you continue down the main quest line. Step 3: (a) You will have received 'Tradecraft' and 'Shadow of Steel.' DO NOT advance in either of these quests. Step 2: Complete 'Reunions' and 'Dangerous Minds.' (For proper completion, keep Preston at the Castle.)

“Step 1: Before completing 'Reunions,' complete all main and both side quests (once each) for the Brotherhood of Steel recon team. You know that method to get the perfect ending where all the factions are at peace?

Brotherhood of steel recon team quests