wrinkles around her eyes were joining hands. … Rosa would never tell Hans about these moments, but Liesel believed that it must have been those prayers that helped Papa survive.

This is an instance where we can tell Liesel is moved by Rosa’s actions and loves Rosa as a result.  Yes, these prayers are overheard; however, they are a testament to how deeply Rosa cares for Hans and, consequently, for Liesel as well.  Times like this make up for Rosa’s tough exterior.

On the other hand, Hans is always gentle.  Hans is happy to teach Liesel to read and even offers to sit with Liesel every night as she has nightmares of her brother’s death.  Hans does this for Liesel until she no longer needs his help:

Liesel told her papa that she should be old enough now to cope on her own with the dreams.  For a moment, he looked a little hurt, but as always with Papa, he gave the right thing to say his best shot.  “Well, thank God.”  He halfway grinned.

The love between Liesel and Hans, as indicated above, is a good-natured love of child and father-figure.  Hans has become so accustomed to sitting with Liesel as she deals with her night terrors, that he has grown fond of the time with Liesel.  Liesel loves Hans for his lack of fear to show his love for her at all times.

In regards to Max, Liesel’s kindred spirit and eventual (implied) true love, there is one simple quote near the end that is the perfect evidence:

Liesel came out. They hugged and cried and fell to the floor.

This embrace happens when Liesel and Max are reunited after the war.  Of course, when they first meet, Max is a starving Jewish boy and Liesel is a guest in Hans’ and Rosa’s house.  They prove themselves to be kindred spirits through their love of books and their tendency towards having nightmares.  Max even writes a book for Liesel on the back of Hitler's Mein Kampf.  All of these things allow Liesel and Max to grow in both friendship and love leading to the embrace within the quotation above.

One quote that is particularly important comes when Liesel first meets Hans, her adoptive father. Her description of his face, and in particular his eyes, is particularly important to establishing what kind of character he is and also foreshadows later events that show his goodness:

Liesel observed the strangeness of her foster father's eyes. They were made of kindness, and silver... Upon seeing those eyes, understood that Hans Hubermann was worth a lot.

The metaphor of silver is used here to convey value, and its combination with kindness is something that quickly establishes Hans as a good character who determines to go on being good, whatever the cost, even during one of the bleakest chapters of humanity's history. This goodness is of course something that Liesel herself experiences, as she arrives at her adoptive family a very troubled young girl, tormented by what she has already experienced.

Hans later goes on to show that love very practically by revealing the truth to Liesel about her mother and the real reason why they are separated. Note what he says to Liesel about the letters he wrote to her, thinking to send them to Liesel as if they were from her mother:

You know, Liesel? I nearly wrote you a reply and signed your mother's name... But I couldn't. I couldn't bring myself.

It was love that caused Hans to write those letters in the first place, but it was a deeper and more genuine love that causes him to tell her the truth about her mother and allows her to identity the cause of her unhappiness, which is of course Hiter.