Here's a mini guide for all routes.
-Look out the window
-Approach the old man
-Daisy, Lunch
-Go for a run
-Linger
-Jump back
-Alleyway
-Swan Park
-Rest
-Check on him
-Ask him about his son
-Inquire about Edward
-Ask him what he knows
-Groceries and Pillow (-Accept his help)
-Stay at Black swan first
-Leave at the second with your friends (-Politely Refuse)
-Stop by at Mr. Scotts before your morning run
-Step inside Mr. Scotts home
-What if their all connected?
-Wait -I like your watch {Convo with Edward}
-Your father must be proud of you {Convo with Edward}
-Mr. Scott adored you {Convo with Edward}
-He looked forward to your visits {Convo with Edward}
-Go Left/Right or Even Duck, all the options are right.
{This works for all routes}
[With Sans and his extra scenes, just don't refuse him anywhere and don't step back when he kisses you... Idk maybe u can step back but I've never tried it because my soul says that if I ever refuse him then I'll meet an early end. Also when he meets you at the building after the shooting {even Mr. Scott dies here, RIP} He will be furious as to why there's another man's cologne on you (Also cuz he's concerned were we were cuz we weren't at the black swan nor at home) {It's just our buddies when we tell them about our bro, they hug us(awwwww)} Stop him from leaving angry {cuz it gives u an adorable scene}]
[With Winding, again, just don't refuse him anywhere.]
[Papyrus can't kill you {I think} so just go by the above options to reach the end with him.]
[I've never tried the Asreil route so sorry guys]
Hope this helps!
<3