(Sr, Pb)CuTe2O6 are quantum magnets featuring spin-1/2 ions that are coupled into a highly frustrated 3D network resulting from a combination of interactions giving equilateral triangles, hyperkagome lattice and uniform chains. The magnetic ground state of these systems is determined by relative strengths of the three interactions. In Pb system, the highly frustrated hyperkagome interaction is dominant which suppresses the long-range magnetic order (LRO). Therefore, it emerges as a potential spin-liquid candidate. Whereas Sr system reveals strong chain interaction with frustrated interchain coupling. This could give rise to LRO that reflects the underlying physics arising from frustration. Recent bulk property measurements have revealed a series of magnetic phases in an external magnetic field. However, the magnetic structure has not been solved. Therefore we wish to investigate magnetic properties of these systems using neutron diffraction.