[Python] Federated Query between two RDFlib graphs

I have two local knowledge graphs in the form of turtle files.

Let's say they look something like: File1 - people.ttl

Bob a person ;
feeds cat-1 ;
trains dog-1 ;
owns house-1 .


File 2 - houses.ttl

house-1 a house ;
worth "$500k" ;
has_address "123 Road Dr." .


if I load these into rdflib as pplGraph and hsGraph:

from rdflib import Graph

pplGraph = Graph().parse('people.ttl')
hsGraph = Graph().parse('houses.ttl')


is there a way to do a federated query between them? Say I want to know the cost of every person's house, how would I write that query?

I know I could do something like:

for s,p,o in hsGraph.triples((None, None, None)):
pplGraph.add((s,p,o))


and then do a non-federated query, but is it possible to keep the two separate and just use the query method?

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