The numbers of extrasolar planets and brown dwarfs have grown steadily since their discoveries in the 1990s. Nonetheless, only one directly imaged wide substellar companion was known around a planet-host star a decade ago. We cross-correlated 2MASS with 8000 square degrees imaged by the VISTA Hemisphere Survey (VHS) to look for nearby high proper motion sources in the Southern sky. Among them, we identified the second wide substellar companion to a planet-host star at 24 pc from the Sun. Understanding the formation and evolution of systems containing of a star and two Jupiter-size bodies with very different separations remains challenging for state-of-the-art formation models. For this reason, we compiled all known wide brown dwarf companions to bright stars and designed a specific program with the SONG high-resolution spectrograph to monitor radial velocity variations searching for potential keplerian signals. We will present the RV periodograms for a couple of bright planet-host stars, discuss current uncertainties, and put our results into context.