Rob Gronkowski's reaction to brother Glenn joining Bills is so Gronk

Glenn Gronkowski, fullback from Kansas State and brother to Patriots tight end Rob Gronkowski, joined the Bills as an undrafted free agent on Saturday.

Not only does that make Glenn the fourth brother in the Gronkowski family to sign with an NFL team, it also means that the 23-year-old Buffalo, New York, native gets to stay close to home.

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True to his social form, Rob tweeted out his reaction shortly thereafter in the Gronkiest way possible —€” congratulating his younger sibling for making it to the bigs, staying close to home, and doling out some big brotherly wisdom ... before concluding with a shoutout to his own team.

The 6-foot-2 and 239-pound Glenn Gronkowski had 16 rushes for 51 yards and a touchdown in three seasons at Kansas State.