Dear Nikola,

a) Thank you for your letter.
b) I'm deferring Lagrangian and Hamiltonian mechanichs at least until after breakfast.
c) My affirmative recommendation is, subject to not hurting the others' feelings, to pursue no conversation without speaking ones mind. As the Romans said: Carpe diem.
d) You are free to relate to Nathaniel anything and everything I said, including my speculations regarding the remote possibility of distant-future guardianship.
e) You may be surprised that Nathaniel will be unexpectedly sympathetic and volunteer, in which case you have opened for yourself another option. 
f) You may be unsurprised if Nathaniel lapses into awkward silence, or starts talking to his dog, in which case you have gained important information.
g) You should feel free to telephone me "whenever the spirit moves you."
h) Bladders were designed by Deus sive Natura as transient storage for organic liquid. Mistakenly using them for metaphors is hazardous to style. Watch out!
EJM