Mi abuelo es menos liberal que el tuyo, mientras que mi padre es más moderno.

Questions & Answers about Mi abuelo es menos liberal que el tuyo, mientras que mi padre es más moderno.

Why is mientras que followed by the indicative es here instead of the subjunctive?
In this sentence, mientras que is used to contrast two established facts (the grandfather's views versus the father's views). When it means "whereas" or "while" in a contrastive sense, it always takes the indicative. You only use the subjunctive with mientras or mientras que when it means "as long as" and refers to a future or hypothetical condition.
Could I just use mientras without the que to mean "while" in this contrast?
You will sometimes hear native speakers use just mientras to contrast two things, but adding que makes it the standard, explicit way to say "whereas" or "while (on the other hand)". Without que, mientras usually implies "while" in the sense of two actions happening at the exact same time.
Why does the sentence use el tuyo instead of just tuyo for "yours"?
Because it acts as a pronoun replacing tu abuelo (your grandfather). In Spanish, when a possessive word stands alone to replace a noun, it needs the definite article (el, la, los, or las) to match the gender and number of that noun. Since abuelo is masculine singular, we use el tuyo.
Is que always the word used for "than" in Spanish comparisons like menos liberal que?
For comparing adjectives, nouns, or adverbs (like saying someone is "more" or "less" something), yes, you almost always use que. The main exception you have learned is when you are comparing with a specific number, where you would use de (such as menos de cincuenta).

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