I agree with all the model identifications. I suspect, however, that the Medical Staff Officer's sword is probably post-CW. The scabbard appears nickle plated which would date it to after 1868 when the plating process was perfected. The M1860 cavalry saber is definitely civil war - they stopped producing them in 1865 and didn't start again until 1906 when the made about 10,000 more, but with steel hilts. You should be able to date it exactly by the markings on the ricasso. The M1852 Navy is likely CW, and definitely pre-1872 when the width of the blade was first reduced.
I agree with the recommendation you get a letter from the family to document their story. I would also suggest, however, that you take it with more than a grain of salt. My experience is that after 150 years of retelling, the stories connected to these relics are usually corrupted beyond recognition.